Cranial ridge

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The cranial ridges, also referred to as exocranial ridges or cranial plates are bony plates on the surface of the forehead on many humanoid species. Some species, such as Humans, Vulcans, and the ancient humanoids do not possess visible cranial ridges.

Ktarians have sharp exocranial ridges, which are also present in Ktarian-Human hybrids. If the mother is human, these ridges can cause a rare complication where they become lodged in the uterine wall, as was the case with Naomi Wildman's birth in 2372. (VOY: "Deadlock")

In the final draft script of ENT: "Two Days and Two Nights", a person off-screen who Charles Tucker III and Malcolm Reed notice in a Risannightclub was scripted to be referred to as having cranial ridges, with Reed stating, "She's got lovely cranial ridges." However, the only comment made about this unseen individual in the final version of the episode is Tucker remarking, "I don't think 'she' is the right pronoun."